Paras, E. L., & Paras, E. C. (1991). Agency, sales and credit transactions. Rex Book Store.
Lua i Stíl Chicago (17ú heag.)Paras, Edgardo Lardizabal, agus Edgardo C. Paras. Agency, Sales and Credit Transactions. Manila: Rex Book Store, 1991.
Lua MLA (9ú heag.)Paras, Edgardo Lardizabal, agus Edgardo C. Paras. Agency, Sales and Credit Transactions. Rex Book Store, 1991.
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